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풀어 주다： 2023-03-23 19:12:01

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本篇文章分享的内容是【php预定义接口】迭代器，现在分享给大家，有需要的朋友可以参考一下本篇文章的内容

Iterator（迭代器）接口

简介：可在内部迭代自己的外部迭代器或类的接口。

具体作用解释

接口摘要：

Iterator extends Traversable {    /* 方法 */
    abstract public mixed current ( void )    abstract public scalar key ( void )    abstract public void next ( void )    abstract public void rewind ( void )    abstract public bool valid ( void )
}

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范例：

Example #1 基本用法（使用 foreach 时，迭代器方法的调用顺序）<?phpclass myIterator implements Iterator {
    private $position = 0;    private $array = array(        "firstelement",        "secondelement",        "lastelement",
    );  

    public function __construct() {
        $this->position = 0;
    }    function rewind() {
        var_dump(__METHOD__);        $this->position = 0;
    }    function current() {
        var_dump(__METHOD__);        return $this->array[$this->position];
    }    function key() {
        var_dump(__METHOD__);        return $this->position;
    }    function next() {
        var_dump(__METHOD__);
        ++$this->position;
    }    function valid() {
        var_dump(__METHOD__);        return isset($this->array[$this->position]);
    }
}$it = new myIterator;foreach($it as $key => $value) {
    var_dump($key, $value);    echo "\n";
}1.rewind -> valid -> current -> key 
2.next -> valid -> current -> key3.next -> valid -> current -> key4.next -> valid?>

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Iterator（迭代器）接口

简介：可在内部迭代自己的外部迭代器或类的接口。

具体作用解释

接口摘要：

Iterator extends Traversable {    /* 方法 */
    abstract public mixed current ( void )    abstract public scalar key ( void )    abstract public void next ( void )    abstract public void rewind ( void )    abstract public bool valid ( void )
}

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范例：

Example #1 基本用法（使用 foreach 时，迭代器方法的调用顺序）<?phpclass myIterator implements Iterator {
    private $position = 0;    private $array = array(        "firstelement",        "secondelement",        "lastelement",
    );  

    public function __construct() {
        $this->position = 0;
    }    function rewind() {
        var_dump(__METHOD__);        $this->position = 0;
    }    function current() {
        var_dump(__METHOD__);        return $this->array[$this->position];
    }    function key() {
        var_dump(__METHOD__);        return $this->position;
    }    function next() {
        var_dump(__METHOD__);
        ++$this->position;
    }    function valid() {
        var_dump(__METHOD__);        return isset($this->array[$this->position]);
    }
}$it = new myIterator;foreach($it as $key => $value) {
    var_dump($key, $value);    echo "\n";
}1.rewind -> valid -> current -> key 
2.next -> valid -> current -> key3.next -> valid -> current -> key4.next -> valid?>

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